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Email authentication

DKIM

A comprehensive collection of questions and answers about DKIM email authentication from email marketers, experts and technical documentation.
What DKIM tag indicates the expiration time of the signature?
Is a DKIM record published in the root domain or subdomain?
What is the 'i' tag in a DKIM signature?
Does DKIM require a specific port for verification?
What DKIM tag is used for notes for human readers?
What DKIM tag indicates the service type?
Does a DKIM signature include the 'From' header by default?
What is the 'q' tag in a DKIM record?
Can DKIM keys be rotated without downtime?
Does DKIM sign the 'Subject' header?
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